const fs = require('fs');
const path = require('path');

async function syncTrackers() {
    const today = new Date().toISOString().split('T')[0];
    const dirPath = path.join(__dirname, 'list');
    const filePath = path.join(dirPath, `${today}.txt`);

    // 1. 检查文件是否已存在
    if (fs.existsSync(filePath)) {
        console.log(`文件 ${today}.txt 已存在，跳过下载。`);
        return;
    }

    const urls = [
        "https://trackerslist.com/all.txt",
        "https://trackerslist.com/http.txt"
    ];

    try {
        console.log("开始获取追踪器列表...");
        
        // 2. 并行获取内容
        const responses = await Promise.all(urls.map(url => 
            fetch(url).then(res => {
                if (!res.ok) throw new Error(`无法获取 ${url}`);
                return res.text();
            })
        ));

        // 3. 合并、去重、过滤空行
        const allLines = responses.flatMap(text => text.trim().split('\n'));
        const uniqueLines = [...new Set(allLines.map(line => line.trim()))].filter(line => line.length > 0);
        const finalContent = uniqueLines.join('\n');

        // 4. 确保目录存在并保存
        if (!fs.existsSync(dirPath)) {
            fs.mkdirSync(dirPath, { recursive: true });
        }

        fs.writeFileSync(filePath, finalContent, 'utf8');
        console.log(`成功生成: ${filePath}`);

    } catch (error) {
        console.error("执行出错:", error.message);
        process.exit(1);
    }
}

syncTrackers();